Fix sql statement for mysql

pkg/db/db.go

@@ -61,12 +61,14 @@ func CreateDBEngine() (engine *xorm.Engine, err error) {
 		if err != nil {
 			return
 		}
-	} else {
+	} else if config.DatabaseType.GetString() == "sqlite" {
 		// Otherwise use sqlite
 		engine, err = initSqliteEngine()
 		if err != nil {
 			return
 		}
+	} else {
+		log.Fatalf("Unknown database type %s", config.DatabaseType.GetString())
 	}
 
 	engine.SetMapper(core.GonicMapper{})

pkg/migration/20200621214452.go

@@ -0,0 +1,93 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2020 Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"fmt"
+	"src.techknowlogick.com/xormigrate"
+	"xorm.io/xorm"
+	"xorm.io/xorm/schemas"
+)
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20200621214452",
+		Description: "Make all dates to iso time",
+		Migrate: func(tx *xorm.Engine) error {
+
+			convertTime := func(table, column string) error {
+
+				var sql string
+
+				switch tx.Dialect().URI().DBType {
+				case schemas.POSTGRES:
+					sql = `
+ALTER TABLE ` + table + ` DROP COLUMN IF EXISTS ` + column + `_ts;
+ALTER TABLE ` + table + ` ADD COLUMN ` + column + `_ts TIMESTAMP WITHOUT TIME ZONE NULL;
+UPDATE ` + table + ` SET ` + column + `_ts = TIMESTAMP 'epoch' + ` + column + ` * INTERVAL '1 second';
+ALTER TABLE ` + table + ` ALTER COLUMN ` + column + ` TYPE TIMESTAMP USING ` + column + `_ts;
+ALTER TABLE ` + table + ` DROP COLUMN ` + column + `_ts;
+`
+				case schemas.MYSQL:
+					sql = `
+ALTER TABLE ` + table + ` DROP COLUMN IF EXISTS ` + column + `_ts;
+ALTER TABLE ` + table + ` ADD ` + column + `_ts DATETIME null;
+UPDATE ` + table + ` SET ` + column + `_ts = FROM_UNIXTIME(` + column + `);
+ALTER TABLE ` + table + ` DROP COLUMN ` + column + `;
+ALTER TABLE ` + table + ` CHANGE ` + column + `_ts ` + column + ` DATETIME NOT NULL;
+`
+				case schemas.SQLITE:
+					// welp
+				default:
+					return fmt.Errorf("unsupported dbms: %s", tx.Dialect().URI().DBType)
+				}
+
+				sess := tx.NewSession()
+				if err := sess.Begin(); err != nil {
+					return err
+				}
+				_, err := sess.Exec(sql)
+				if err != nil {
+					_ = sess.Rollback()
+					return err
+				}
+				if err := sess.Commit(); err != nil {
+					return err
+				}
+				return nil
+			}
+
+			for table, columns := range map[string][]string{
+				"buckets": {
+					"created",
+					"updated",
+				},
+			} {
+				for _, column := range columns {
+					if err := convertTime(table, column); err != nil {
+						return err
+					}
+				}
+			}
+
+			return nil
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return nil
+		},
+	})
+}